US5781986A - Method of making a magnetic recording/reading head - Google Patents

Method of making a magnetic recording/reading head Download PDF

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Publication number
US5781986A
US5781986A US08/560,384 US56038495A US5781986A US 5781986 A US5781986 A US 5781986A US 56038495 A US56038495 A US 56038495A US 5781986 A US5781986 A US 5781986A
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US
United States
Prior art keywords
magnetic
face
substrate
pole
providing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US08/560,384
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English (en)
Inventor
François Maurice
Jean-Marc Coutellier
François-Xavier Pirot
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thales SA
Technicolor SA
Original Assignee
Thomson Multimedia SA
Thomson CSF SA
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Filing date
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Assigned to THOMSON-CSF, THOMSON MULTIMEDIA reassignment THOMSON-CSF ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: COUTELLIER, JEAN-MARC, MAURICE, FRANCOIS, PIROT, FRANCOIS-XAVIER
Application granted granted Critical
Publication of US5781986A publication Critical patent/US5781986A/en
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Expired - Fee Related legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B21/00—Head arrangements not specific to the method of recording or reproducing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/17—Construction or disposition of windings
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/31—Structure or manufacture of heads, e.g. inductive using thin films
    • G11B5/3103—Structure or manufacture of integrated heads or heads mechanically assembled and electrically connected to a support or housing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/31—Structure or manufacture of heads, e.g. inductive using thin films
    • G11B5/3109—Details
    • G11B5/313—Disposition of layers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/31—Structure or manufacture of heads, e.g. inductive using thin films
    • G11B5/3176—Structure of heads comprising at least in the transducing gap regions two magnetic thin films disposed respectively at both sides of the gaps
    • G11B5/3179—Structure of heads comprising at least in the transducing gap regions two magnetic thin films disposed respectively at both sides of the gaps the films being mainly disposed in parallel planes
    • G11B5/3183—Structure of heads comprising at least in the transducing gap regions two magnetic thin films disposed respectively at both sides of the gaps the films being mainly disposed in parallel planes intersecting the gap plane, e.g. "horizontal head structure"
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/49—Fixed mounting or arrangements, e.g. one head per track
    • G11B5/4969—Details for track selection or addressing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/49021—Magnetic recording reproducing transducer [e.g., tape head, core, etc.]
    • Y10T29/49032—Fabricating head structure or component thereof
    • Y10T29/49036—Fabricating head structure or component thereof including measuring or testing
    • Y10T29/49043—Depositing magnetic layer or coating
    • Y10T29/49044—Plural magnetic deposition layers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/49021—Magnetic recording reproducing transducer [e.g., tape head, core, etc.]
    • Y10T29/49032—Fabricating head structure or component thereof
    • Y10T29/4906—Providing winding
    • Y10T29/49064—Providing winding by coating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/49021—Magnetic recording reproducing transducer [e.g., tape head, core, etc.]
    • Y10T29/49032—Fabricating head structure or component thereof
    • Y10T29/4906—Providing winding
    • Y10T29/49066—Preformed winding

Definitions

  • the invention relates to a method for making a magnetic recording/reading head. It can be applied especially to the making of multiple-track heads for the reading of all types of media such as magnetic disks, magnetic tapes and magnetic cards, in all fields covering all types of equipment such as video recorders, computer peripherals, data recorders for space vehicles, etc.
  • the writing and/or reading of a large number of tracks very close to one another requires a magnetic head having elementary heads compatible with an information density of this type.
  • the French patent application No. 2 630 853 describes the organization of a matrix head adapted to such an application.
  • the French patent 2 648 940 describes various methods of making such a head.
  • the invention proposes the making of an integrated head with its coils and also the integration of the control circuits. This removes the drawbacks of the prior art.
  • the resulting component is potentially inexpensive and provides for a greater density of gaps in a matrix organization of magnetic heads.
  • the integrated head takes the form of a component combining control logic, power transistors, multiple-turn coils and magnetic circuits.
  • the invention therefore relates to a method for the making of a magnetic recording/reading head comprising the following steps:
  • the invention also relates to a magnetic recording/reading head comprising a non-magnetic substrate having, on one face, at least one magnetic excitation conductor and, on this face or on the opposite face, two magnetic poles separated by a gap as well as an element made of a material with high magnetic permeability having a U-shape, with the arms of this U being substantially perpendicular to the face bearing the magnetic poles and with the ends of the arms being each magnetically coupled with a magnetic pole, said element and said poles forming a magnetic circuit that surrounds the conductor, wherein the substrate is made of a semiconductor material in which the control circuits to which the conductor is connected are implanted.
  • FIG. 1 shows a general exemplary embodiment according to the invention
  • FIG. 2 shows a detailed example of a magnetic head according to the invention
  • FIGS. 3a to 3e show a method for the making of a magnetic head according to the invention
  • FIGS. 4a to 4e show a variant of the method of manufacture according to the invention
  • FIG. 5 shows a magnetic head and a method of manufacture according to which magnetic poles are not directly on the substrate plate
  • FIG. 6 shows a variant of the method of manufacture of FIG. 5
  • FIG. 7 shows an application of the invention to the making of matrix magnetic head
  • FIGS. 8 to 14 show different modes of coils of a matrix magnetic head.
  • control logic circuits, the supply transistors and the coils are made on a substrate of semiconductor material (silicon) by using a technology that is now tested and widely used on an industrial scale such as, for example, a technology using complementary MOS transistors and a double level of metallization.
  • FIG. 1 gives a schematic view of such a circuit of the kind that can be obtained on wafers in the semiconductor industry. It will be noted that the connections are positioned on the top and bottom edges of the chip so as to free the right-hand and left-hand edges for the running of the tape.
  • the control transistors have a resistance well below that of the coils so that the currents are determined by the impedance of said coils. It follows therefrom that the heat dissipation zone is that of the coils.
  • FIG. 2 shows an example of a schematic sectional view in the zone of the coils. It shows a magnetic circuit with a gap imbricated in a coil.
  • the substrate 1 has a substrate 1 bearing, on one of its faces 10, magnetic excitation conductors 2 or coil wires.
  • the substrate 1 is, for example, made of semiconductor material (silicon for example) and control circuits 7, 7' are implanted in the substrate.
  • the circuits 7, 7' are therefore semiconductor circuits and contain power transistor circuits that can be used to supply the connection wires with current. They are then connected by means known in the prior art to the excitation wires 2.
  • the circuits 7, 7' may also contain logic control circuits receiving commands from the exterior and controlling the power supply circuits of the excitation wires.
  • a layer of insulator material 13 may be provided above the excitation wires 2. This layer, whose surface is plane and slightly curved, enables the poles 3, 3' to be received easily and to be insulated from the excitation wires 2.
  • the poles 3, 3' are made advantageously according to the method for the manufacture of thin layers as described in the French patent application No. 2 605 783.
  • Holes 12 and 12' go through the substrate 1 and the layer 13 and contain a material with high magnetic permeability 4 in such a way that this material is in contact or almost in contact with the poles 3, 3' so as to be magnetically coupled with the poles 3, 3'.
  • the layer 4 therefore magnetically couples the poles 3 and 3' to each other.
  • a supporting plate 6 which is preferably rigid is fixed to the face 11 of the substrate 1 with, for example, bonder 5.
  • the plate 6 is made of a material that is a good conductor of heat, for example silicon, to enable the cooling of the circuits.
  • the excitation wires 2 and the circuits 7, 7' are positioned on the face 10 of the substrate but in another embodiment they could be on the face 11.
  • FIGS. 3a to 3e a description shall now be given of a method for making a magnetic head according to the invention.
  • control circuits 7, 7' and excitation wires 2 are made on the surface 10 of a substrate 1.
  • the control circuits 7, 7' are implanted in the substrate and the excitation wires 2 are made on the surface of the substrate.
  • the excitation wires 2 are electrically connected to the control circuits 7, 7'.
  • the face 10 and the excitation wires are covered with an insulator layer 13. This layer is preferably flattened or slightly curved (in the case of applications for the reading of magnetic tapes).
  • the magnetic poles 3, 3' separated by a gap are made on the layer 13.
  • the magnetic pole 3 is made on the face 10 and then a layer of non-magnetic material 30 is made on this pole.
  • This non-magnetic layer 30 has a thickness smaller than that of the pole 3. A layer of magnetic material designed to form the pole 3 is then made on the unit. Then, this magnetic layer and the non-magnetic layer 30 are machined above the pole 3 so as to bring out this pole 3. Thus the structure of FIG. 3b is obtained.
  • the layer of non-magnetic material 30 located between the poles 3' and the face 10 has been kept but, according to another embodiment, it could be eliminated.
  • holes 12, 12' are drilled in the substrate 1 from the face 11.
  • the hole 12 preferably reaches the pole 3.
  • the hole 12' reaches the layer 30 or the pole 3'.
  • the holes 12 and 12' may also be holes that do not lead into the substrate 1 or the layer 13. It is enough then that there should be a magnetic coupling between the poles 3, 3' and the holes 12, 12' respectively.
  • a material with high magnetic permeability 4 is then deposited in the holes 12, 12' and on the zone of the substrate 1 located between the holes. This material 4 is aimed at obtaining the magnetic coupling of the poles 3 and 3' and forming the element that closes the magnetic circuit of the magnetic head.
  • the face 11 of substrate may be fixed to a supporting plate 6 whose role is to make the unit rigid as well as possibly to act as a cooling unit.
  • the thickness of the substrate 1 may be equal to about a hundred micrometers while that of the pole 3 may be equal to about ten micrometers while the non-magnetic layer 30 is some micrometers thick.
  • poles 3, 3' sendust (alloy of iron, tin and aluminium)
  • layer of magnetic material 4 permalloy.
  • FIGS. 4a to 4e show an alternative to the method described here above.
  • the excitation wires and circuits 7, 7' are made on the face 11 of the substrate.
  • the magnetic poles 3, 3' are made on the face 10.
  • the holes 12, 12' are made during the third step (FIG. 4c) as here above. Then, the magnetic material 4 is deposited in the holes 12, 12' as above (FIG. 4d). Finally, a supporting element 6 is attached to the unit.
  • FIG. 4e a structure which differs from that of FIG. 3e by the fact that the excitation wires and the control circuits 7, 7' are made on the face 11 instead of on the face 10.
  • a composite plate 9 made of non-magnetic material 90 and of magnetic material 91 is made separately.
  • the non-magnetic material 90 is, for example, glass and the magnetic material 91 is ferrite.
  • the magnetic poles 3, 3' are made on a face 92 above magnetic zones 91 so that each of them is magnetically coupled to the face 93 of the plate 9.
  • this face is then fixed by bonding, for example, to the face 10 of the substrate.
  • the substrate 1 is then thinned out on the face 11 side and then holes are drilled in the substrate 1 before the electrodeposition of permalloy as here above.
  • a supporting plate 6 of silicon or heat conductor may then be bonded to make the unit rigid.
  • the U-shaped permalloy structure may be obtained on the active faces of the chips (after the making of blind holes by chemical corrosion) and then the heat conductor is bonded to this active face or thinned out by the rear face up to the permalloy and the unit is bonded to the glass-ferrite composite material.
  • a wafer 8 of homogeneous and non-magnetic material such as silicon is used instead of using a plate 9 of composite material.
  • the magnetic poles 3, 3' are made on this wafer.
  • this wafer is thinned out.
  • this wafer 8 is attached to the substrate plate 1 bearing the excitation wires 2 and the control circuits.
  • the plate 1 is thinned out.
  • the holes 12 and 12' are made through the substrate 1 and through the wafer 8.
  • the magnetic material 4 deposited in the holes 12, 12' enables the constituting of the magnetic circuits coupling the two magnetic poles 3 and 3'.
  • the first silicon substrate may be drilled with its blind holes (leading to the poles) before the bonding of the second substrate. These same blind holes may be filled with permalloy before bonding. This brings us to the variants explained in the above paragraph.
  • the two silicon substrates 1 and 8 may have the same dimensions
  • the density of the gaps may be greater than in the previous approach because there is no longer any glass-ferrite composite material used.
  • the coils may be made in two levels of metallization with the possibility of connecting these two levels by cross-connections that go through the substrate 1 and even through the supporting plate 6.
  • the invention can be applied to the making of a set of matrix heads as shown in FIG. 7 and described in the French patent application No. 2 630 853.
  • a head such as T1 has two poles 3, 3' separated by a gap 30, each located on a magnetic pad PL1 connected to a layer or to a plate of magnetic material 1.
  • Magnetic excitation conductors or row coils L1 enable the induction of a magnetic flux in the magnetic circuits of a row of magnetic heads.
  • Other magnetic excitation conductors or column coils C1 enable the induction of a magnetic flux in the magnetic circuits of a column of magnetic heads.
  • a magnetic head located at the intersection of a row coil and a column coil is excited.
  • the coil conductors are not housed in grooves. They are on the surface of the substrate 1.
  • the working of the magnetic heads is, however, the same. Their mode of coiling determines the pads PL1.
  • FIGS. 8 to 14 show different modes of coils made possible by the method of the invention.
  • FIG. 8 shows a matrix head in which each magnetic head has its own two poles.
  • Each row of magnetic heads has a row coil, D1 for example, that is individually coiled around the poles D1 of a row.
  • Each column of magnetic heads has a column coil S1 that is coiled around all the poles D1 to D5 of a column together.
  • FIG. 9 shows a matrix head in which a magnetic pole is common to two heads.
  • a row coil D1 is coiled around the poles of a row.
  • FIG. 10 shows a mode of coiling in which it is the column coils that are each common to a column of poles and in which there are two row coils coiled around the poles of a row alternately.
  • FIG. 11 shows a mode of coiling similar to that of FIG. 9, but the magnetic heads are positioned in a zigzag arrangement and connect the magnetic poles diagonally.
  • FIG. 12 shows a mode of coiling similar to that of FIG. 11 but wherein the pads and poles are square-shaped. They are positioned at 45° with respect to the direction of the rows and columns.
  • FIG. 13 shows a mode of coiling in which the pads and poles positioned at 45° (as in FIG. 12) have row coils and column coils coiled around them individually.
  • FIG. 14 shows a mode of coiling in which there are two coils per row D3, D4 for example, coiled around the poles of a row alternately as well as two coils per column S1 and S2 for example, coiled around the poles of a column alternately.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Magnetic Heads (AREA)
US08/560,384 1994-11-29 1995-11-17 Method of making a magnetic recording/reading head Expired - Fee Related US5781986A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9414289A FR2727556B1 (fr) 1994-11-29 1994-11-29 Procede de realisation d'une tete magnetique d'enregistrement/lecture et tete d'enregistrement/lecture
FR9414289 1994-11-29

Publications (1)

Publication Number Publication Date
US5781986A true US5781986A (en) 1998-07-21

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US08/560,384 Expired - Fee Related US5781986A (en) 1994-11-29 1995-11-17 Method of making a magnetic recording/reading head

Country Status (8)

Country Link
US (1) US5781986A (fr)
EP (1) EP0716410B1 (fr)
JP (1) JPH08235529A (fr)
KR (1) KR100386904B1 (fr)
CN (1) CN1149539C (fr)
DE (1) DE69525431T2 (fr)
FR (1) FR2727556B1 (fr)
MX (1) MX9504949A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6256864B1 (en) * 1998-02-11 2001-07-10 Commissariat A L'energie Atomique Process for producing an assembly having several magnetic heads and multiple head assembly obtained by this process
US20040130997A1 (en) * 2001-06-07 2004-07-08 Jean-Louis Duhamel Method and device for mastering a copy-protected optical disc and copy-protected optical disc

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2750787B1 (fr) * 1996-07-05 1998-11-13 Thomson Csf Tete magnetique matricielle d'enregistrement/lecture et procede de realisation

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3564522A (en) * 1966-12-16 1971-02-16 Data Disc Inc Transducer with thin film coil and semiconductor switching
DE1952402A1 (de) * 1969-10-17 1971-04-22 Philips Patentverwaltung Magnetkopf
US3672043A (en) * 1965-12-06 1972-06-27 Ncr Co Miniature magnetic head
EP0032230A2 (fr) * 1980-01-14 1981-07-22 Siemens Aktiengesellschaft Transducteur magnétique intégré et procédé pour sa fabrication
US4477853A (en) * 1981-04-15 1984-10-16 Eastman Kodak Company Multitrack magnetic head
US4731157A (en) * 1984-02-03 1988-03-15 Commissariat A L'energie Atomique Process for the production of a magnetic head for perpendicular recording
EP0269489A1 (fr) * 1986-10-31 1988-06-01 Commissariat A L'energie Atomique Procédé de réalisation d'une tête magnétique permettant de simplifier la réalisation des connexions électriques
WO1990007772A1 (fr) * 1988-12-23 1990-07-12 Thomson-Csf Procede de realisation d'une tete magnetique d'enregistrement lecture et tete magnetique obtenue par ce procede
EP0406052A1 (fr) * 1989-06-27 1991-01-02 Thomson-Csf Procédé de réalisation de tête magnétique multipiste, et tête magnétique multipiste
US5042140A (en) * 1989-04-14 1991-08-27 Compagnie Europeenne De Composants Electroniques Lcc Process for making an apparatus utilizing a layered thin film structure
US5067230A (en) * 1989-07-04 1991-11-26 Thomson-Csf Method for the manufacture of planar magnetic heads by making cavities in a non-magnetic wafer
EP0463908A1 (fr) * 1990-06-26 1992-01-02 Thomson-Csf Dispositif d'enregistrement magnétique à pluralité de têtes magnétiques
WO1992014250A1 (fr) * 1991-02-01 1992-08-20 Richard Spitzer Alignement de microstructures et systeme d'activation de ces microstructures

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FR2605783B1 (fr) * 1986-10-28 1992-05-15 Thomson Csf T ete magnetique d'enregistrement/lecture en couches minces et son procede de realisation
FR2630853B1 (fr) 1988-04-27 1995-06-02 Thomson Csf Dispositif matriciel a tetes magnetiques notamment en couches minces
JPH01319111A (ja) * 1988-06-20 1989-12-25 Fujitsu Ltd 薄膜磁気ヘッド
FR2651912B1 (fr) * 1989-09-12 1991-10-31 Europ Composants Electron Procede de realisation des pieces polaires et de l'entrefer de tetes magnetiques en couches minces pour application informatique audio ou video.
JPH0652516A (ja) * 1992-07-30 1994-02-25 Ricoh Co Ltd 薄膜磁気ヘッド及び薄膜磁気ヘッド形成方法

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3672043A (en) * 1965-12-06 1972-06-27 Ncr Co Miniature magnetic head
US3564522A (en) * 1966-12-16 1971-02-16 Data Disc Inc Transducer with thin film coil and semiconductor switching
DE1952402A1 (de) * 1969-10-17 1971-04-22 Philips Patentverwaltung Magnetkopf
EP0032230A2 (fr) * 1980-01-14 1981-07-22 Siemens Aktiengesellschaft Transducteur magnétique intégré et procédé pour sa fabrication
US4477853A (en) * 1981-04-15 1984-10-16 Eastman Kodak Company Multitrack magnetic head
US4731157A (en) * 1984-02-03 1988-03-15 Commissariat A L'energie Atomique Process for the production of a magnetic head for perpendicular recording
EP0269489A1 (fr) * 1986-10-31 1988-06-01 Commissariat A L'energie Atomique Procédé de réalisation d'une tête magnétique permettant de simplifier la réalisation des connexions électriques
WO1990007772A1 (fr) * 1988-12-23 1990-07-12 Thomson-Csf Procede de realisation d'une tete magnetique d'enregistrement lecture et tete magnetique obtenue par ce procede
US5042140A (en) * 1989-04-14 1991-08-27 Compagnie Europeenne De Composants Electroniques Lcc Process for making an apparatus utilizing a layered thin film structure
EP0406052A1 (fr) * 1989-06-27 1991-01-02 Thomson-Csf Procédé de réalisation de tête magnétique multipiste, et tête magnétique multipiste
US5067230A (en) * 1989-07-04 1991-11-26 Thomson-Csf Method for the manufacture of planar magnetic heads by making cavities in a non-magnetic wafer
EP0463908A1 (fr) * 1990-06-26 1992-01-02 Thomson-Csf Dispositif d'enregistrement magnétique à pluralité de têtes magnétiques
WO1992014250A1 (fr) * 1991-02-01 1992-08-20 Richard Spitzer Alignement de microstructures et systeme d'activation de ces microstructures

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6256864B1 (en) * 1998-02-11 2001-07-10 Commissariat A L'energie Atomique Process for producing an assembly having several magnetic heads and multiple head assembly obtained by this process
US20040130997A1 (en) * 2001-06-07 2004-07-08 Jean-Louis Duhamel Method and device for mastering a copy-protected optical disc and copy-protected optical disc

Also Published As

Publication number Publication date
EP0716410A3 (fr) 1998-04-15
FR2727556B1 (fr) 1997-01-03
KR100386904B1 (ko) 2003-08-02
DE69525431T2 (de) 2002-10-10
CN1151063A (zh) 1997-06-04
EP0716410A2 (fr) 1996-06-12
FR2727556A1 (fr) 1996-05-31
KR960019253A (ko) 1996-06-17
EP0716410B1 (fr) 2002-02-13
JPH08235529A (ja) 1996-09-13
DE69525431D1 (de) 2002-03-21
CN1149539C (zh) 2004-05-12
MX9504949A (es) 1997-01-31

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